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/*
libltc - en+decode linear timecode
Copyright (C) 2006-2012 Robin Gareus <robin@gareus.org>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library.
If not, see <http://www.gnu.org/licenses/>.
*/
#include "ltc/ltc.h"
#ifndef SAMPLE_CENTER // also defined in encoder.h
#define SAMPLE_CENTER 128 // unsigned 8 bit.
#endif
struct LTCDecoder {
LTCFrameExt* queue;
int queue_len;
int queue_read_off;
int queue_write_off;
unsigned char biphase_state;
unsigned char biphase_prev;
unsigned char snd_to_biphase_state;
int snd_to_biphase_cnt; ///< counts the samples in the current period
int snd_to_biphase_lmt; ///< specifies when a state-change is considered biphase-clock or 2*biphase-clock
double snd_to_biphase_period; ///< track length of a period - used to set snd_to_biphase_lmt
ltcsnd_sample_t snd_to_biphase_min;
ltcsnd_sample_t snd_to_biphase_max;
unsigned short decoder_sync_word;
LTCFrame ltc_frame;
int bit_cnt;
ltc_off_t frame_start_off;
ltc_off_t frame_start_prev;
float biphase_tics[LTC_FRAME_BIT_COUNT];
int biphase_tic;
};
void decode_ltc(LTCDecoder *d, ltcsnd_sample_t *sound, size_t size, ltc_off_t posinfo);
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